Question

A decomposition reaction starts with one reactant and ends up with two or more

products. Which of the following reactions are decomposition reactions?
NaCl --> Na+ Cl2
H2+02 --> H20
NaOH + HCI--> HOH + NaCl
O H2O --> H2 + O2
O Na + Cl2--> NaCl

Answer 1

A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. Examples include NH4Cl -> NH3 + HCl and H2O2 -> H2O + O2. The reaction O + H2O -> H2 + O2 is a decomposition reaction, while the other options provided are not.

Step-by-step explanation:

A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. The key characteristics of a decomposition reaction are: one substance as a reactant and more than one substance as the products. Examples of decomposition reactions include:

• NH4Cl → NH3 + HCl
• H2O2 → H2O + O2

Based on the given options:

• NaCl → Na + Cl2 is not a decomposition reaction, as it starts with one reactant and ends up with two products.
• H2 + O2 → H2O is not a decomposition reaction, as it starts with two reactants and ends up with one product.
• NaOH + HCl → HOH + NaCl is not a decomposition reaction, as it starts with two reactants and ends up with two products.
• O + H2O → H2 + O2 is a decomposition reaction, as it starts with one reactant and ends up with two products.
• Na + Cl2 → NaCl is not a decomposition reaction, as it starts with two reactants and ends up with one product.